package com.atguigu.flink.chapter05.transform;

import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;

/**
 * @Author lzc
 * @Date 2023/6/19 08:52
 */
public class MapDemo {
    public static void main(String[] args) {
        Configuration conf = new Configuration();
        conf.setInteger("rest.port", 2000);
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(conf);
        env.setParallelism(1);
    
        env
            .fromElements(10, 20, 30, 40)
            //.map( value -> value * value)
            .map(new MapFunction<Integer, Tuple2<Long, Integer>>() {
                @Override
                public Tuple2<Long, Integer> map(Integer value) throws Exception {
                    return Tuple2.of(1L, value);
                }
                
            })
            .print();
        
        
        try {
            env.execute();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
